I'm a youthful 57 y.o. nonsmoker, light drinker, workout regularly. I take Norvasc and Atacand for hypertension. My wife & I have long enjoyed a robust sex life but over the last six months attaining and maintaining a full erection has become increasinging problematic. I'd like to get some feedback from "real folks" who have expirence with Viagra, Cialis, and Levitra and can advise me as to their preferences. Cialis sounds attractive because of the extended usefullness span - up to 36 hours from what I've read. Any comments are welcomed. Thanks! Chet B.